Evolution of the Kara Ore-Magmatic System (Eastern Transbaikalia, Russia): Experience in Applying Small-Scale Geochemical Survey

Efremov, S. V.; Спиридонов, А. М.; Goryachev, N. A.; Budyak, A. E.

doi:10.1134/s1075701521030041

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Finally, watanabeite is cited also from other localities but no chemical or structural data are given to confirm such an identification (e.g. Papavasiliou et al, 2016;Ahmed et al, 2018;Efremov et al, 2021). As will be shown later, some of these identifications of watanabeite reported in literature probably correspond to other mineral species.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure of Pb-bearing watanabeite from Pefka, Greece

Biagioni,

Voudouris,

Moëlo

et al. 2024

MinMag

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Watanabeite from the Pefka epithermal deposit, northeastern Greece, was examined using single-crystal X-ray diffraction and electron microprobe analysis. The empirical formula of watanabeite is Cu3.93Fe0.10Ag0.01Pb0.23As1.55Sb0.19S4.99. This mineral is orthorhombic, space group Amm2, with unit-cell parameters a = 10.9601(5), b = 14.6498(8), c = 10.3001(5) Å, V = 1653.82(14) Å3 and Z = 8. The crystal structure was solved and refined to R1 = 0.0471 for 2108 unique reflections with Fo > 4σ(Fo) and 123 refined parameters. The crystal structure of watanabeite can be described as a three-dimensional framework of Cu-centred tetrahedra; cavities of the tetrahedral scaffolding host Cu6S and As2(Pb,Sb,As)2S7 clusters. On the basis of structural data, the formula of watanabeite could be written as [III]Cu3[IV]Cu5As3(Pb,Sb,As)S10 (Z = 4), considering the three independent three-fold Cu sites and the three independent tetrahedrally coordinated Cu sites as aggregated positions. The occurrence of Pb2+ in watanabeite is probably related to the substitution Cu+ + (As,Sb)3+ = 2Me2+, where Me = Pb, Fe, Zn and formally divalent Cu. The relationships with tetrahedrite-group minerals are discussed on the basis of the refined structural model, highlighting possible crystal chemical implications of such relationships.

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Section: Introductionmentioning

confidence: 99%

Crystal structure of Pb-bearing watanabeite from Pefka, Greece

Biagioni,

Voudouris,

Moëlo

et al. 2024

MinMag

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Mineralogy and Primary Sources of Gold in the Davenda-Klyuchevskiy Ore-Placer Cluster (Eastern Transbaikalia)

Kolpakov,

Nevolko,

Fominykh

2024

Geol. Ore Deposits

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Use of Digital Models of Geological Structure to Identify Paleovolcanic Structures Controlling Porphyry Ore Objects

Efremov,

Goryachev,

Budyak

et al. 2024

Geodin. tektonofiz.

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The article is devoted to the implementation of the methodology for paleovolcanic structure analyzing using 3D visualization of the model of the geological territory structure based on the relief digital model. The approach used made it possible to identify two paleovolcanic apparatuses and their structural elements: cone fragments, explosive domes, porphyritic stocks, ring fault zones with localization of dike belts in them. This, within the framework of the evolution model of porphyry ore systems, made it possible to identify promising areas for prospecting on ore objects of a given type. The procedure was checked on the basis of geochemical survey results. The regular control by the selected structural elements of geochemical fields was shown. The analysis of the spatial position of the selected structural blocks with a certain geochemical characteristic rather well into the evolution model of the porphyry ore systems. In all cases the control of geochemical halos by porphyry stocks is noted, the material rock complexes that are fragments of the zonal stone hat of the porphyry ore object, are quite clearly distinguished. Within the area of work, three ore-magmatic systems can be identified at a low level of erosion shear, potentially accompanied by porphyry-type ore mineralization.

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Evolution of the Kara Ore-Magmatic System (Eastern Transbaikalia, Russia): Experience in Applying Small-Scale Geochemical Survey

Cited by 3 publications

References 5 publications

Crystal structure of Pb-bearing watanabeite from Pefka, Greece

Crystal structure of Pb-bearing watanabeite from Pefka, Greece

Mineralogy and Primary Sources of Gold in the Davenda-Klyuchevskiy Ore-Placer Cluster (Eastern Transbaikalia)

Use of Digital Models of Geological Structure to Identify Paleovolcanic Structures Controlling Porphyry Ore Objects

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